| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.bookkeeper.metadata.etcd; |
| |
| import com.coreos.jetcd.Client; |
| import com.coreos.jetcd.data.ByteSequence; |
| import com.google.common.collect.Maps; |
| import java.net.UnknownHostException; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.function.Consumer; |
| import java.util.function.Function; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.bookkeeper.client.BKException; |
| import org.apache.bookkeeper.common.concurrent.FutureUtils; |
| import org.apache.bookkeeper.discover.RegistrationClient; |
| import org.apache.bookkeeper.metadata.etcd.helpers.KeySetReader; |
| import org.apache.bookkeeper.net.BookieSocketAddress; |
| import org.apache.bookkeeper.versioning.Versioned; |
| |
| /** |
| * Etcd based registration client. |
| */ |
| @Slf4j |
| class EtcdRegistrationClient implements RegistrationClient { |
| |
| private static Function<ByteSequence, BookieSocketAddress> newBookieSocketAddressFunc(String prefix) { |
| return bs -> { |
| String addrStr = bs.toStringUtf8(); |
| try { |
| return new BookieSocketAddress(addrStr.replace(prefix, "")); |
| } catch (UnknownHostException e) { |
| throw new RuntimeException("Unknown bookie address '" + addrStr + "' : ", e); |
| } |
| }; |
| } |
| |
| private final EtcdWatchClient watchClient; |
| private final KeySetReader<BookieSocketAddress> writableBookiesReader; |
| private final KeySetReader<BookieSocketAddress> readonlyBookiesReader; |
| private Map<RegistrationListener, Consumer<Versioned<Set<BookieSocketAddress>>>> writableListeners = |
| Maps.newHashMap(); |
| private Map<RegistrationListener, Consumer<Versioned<Set<BookieSocketAddress>>>> readonlyListeners = |
| Maps.newHashMap(); |
| |
| EtcdRegistrationClient(String scope, |
| Client client) { |
| this.watchClient = new EtcdWatchClient(client); |
| this.writableBookiesReader = new KeySetReader<>( |
| client, |
| watchClient, |
| newBookieSocketAddressFunc(EtcdUtils.getWritableBookiesBeginPath(scope)), |
| ByteSequence.fromString(EtcdUtils.getWritableBookiesBeginPath(scope)), |
| ByteSequence.fromString(EtcdUtils.getWritableBookiesEndPath(scope)) |
| ); |
| this.readonlyBookiesReader = new KeySetReader<>( |
| client, |
| watchClient, |
| newBookieSocketAddressFunc(EtcdUtils.getReadonlyBookiesBeginPath(scope)), |
| ByteSequence.fromString(EtcdUtils.getReadonlyBookiesBeginPath(scope)), |
| ByteSequence.fromString(EtcdUtils.getReadonlyBookiesEndPath(scope)) |
| ); |
| } |
| |
| |
| @Override |
| public void close() { |
| this.writableBookiesReader.close(); |
| this.readonlyBookiesReader.close(); |
| this.watchClient.close(); |
| } |
| |
| @Override |
| public CompletableFuture<Versioned<Set<BookieSocketAddress>>> getWritableBookies() { |
| return writableBookiesReader.read(); |
| } |
| |
| @Override |
| public CompletableFuture<Versioned<Set<BookieSocketAddress>>> getAllBookies() { |
| return FutureUtils.exception(new BKException.BKIllegalOpException()); |
| } |
| |
| @Override |
| public CompletableFuture<Versioned<Set<BookieSocketAddress>>> getReadOnlyBookies() { |
| return readonlyBookiesReader.read(); |
| } |
| |
| private static CompletableFuture<Void> registerListener( |
| KeySetReader<BookieSocketAddress> keySetReader, |
| Map<RegistrationListener, Consumer<Versioned<Set<BookieSocketAddress>>>> listeners, |
| RegistrationListener listener |
| ) { |
| Consumer<Versioned<Set<BookieSocketAddress>>> consumer; |
| synchronized (listeners) { |
| consumer = listeners.get(listener); |
| if (null != consumer) { |
| // already registered |
| return FutureUtils.Void(); |
| } else { |
| consumer = bookies -> listener.onBookiesChanged(bookies); |
| listeners.put(listener, consumer); |
| } |
| } |
| return keySetReader |
| .readAndWatch(consumer) |
| .thenApply(ignored -> null); |
| } |
| |
| private static CompletableFuture<Void> unregisterListener( |
| KeySetReader<BookieSocketAddress> keySetReader, |
| Map<RegistrationListener, Consumer<Versioned<Set<BookieSocketAddress>>>> listeners, |
| RegistrationListener listener |
| ) { |
| Consumer<Versioned<Set<BookieSocketAddress>>> consumer = listeners.get(listener); |
| if (null == consumer) { |
| return FutureUtils.Void(); |
| } else { |
| return keySetReader.unwatch(consumer); |
| } |
| } |
| |
| @Override |
| public CompletableFuture<Void> watchWritableBookies(RegistrationListener listener) { |
| return registerListener( |
| writableBookiesReader, |
| writableListeners, |
| listener |
| ); |
| } |
| |
| @Override |
| public void unwatchWritableBookies(RegistrationListener listener) { |
| unregisterListener( |
| writableBookiesReader, |
| writableListeners, |
| listener |
| ); |
| } |
| |
| @Override |
| public CompletableFuture<Void> watchReadOnlyBookies(RegistrationListener listener) { |
| return registerListener( |
| readonlyBookiesReader, |
| readonlyListeners, |
| listener |
| ); |
| } |
| |
| @Override |
| public void unwatchReadOnlyBookies(RegistrationListener listener) { |
| unregisterListener( |
| readonlyBookiesReader, |
| readonlyListeners, |
| listener |
| ); |
| } |
| |
| } |